CVE-2026-55078
Last modified
CVE-2026-55078 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Coder allows organizations to provision remote development environments via Terraform. Starting in version 2.17.0 and prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, `POST /api/v2/files` converts zip uploads to tar in memory via `CreateTarFromZip`, which enforced a per-entry size limit but no aggregate limit on total decompressed output, writing to an unbounded in-memory buffer. EPSS estimates a 0.60% chance of exploitation in the next 30 days.
Description
Coder allows organizations to provision remote development environments via Terraform. Starting in version 2.17.0 and prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, `POST /api/v2/files` converts zip uploads to tar in memory via `CreateTarFromZip`, which enforced a per-entry size limit but no aggregate limit on total decompressed output, writing to an unbounded in-memory buffer. Exploitation requires authenticated file-upload access and the impact is limited to availability (denial of service). The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 adds a metadata preflight check that sums projected entry sizes and a streaming writer that enforces the aggregate limit during decompression. As a workaround, restrict file-upload permissions to trusted users or place a reverse proxy with request-body size limits in front of `coderd`.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Coder | Coder | >= 2.17.0, < 2.29.17 |
| Coder | Coder | >= 2.30.0, < 2.32.7 |
| Coder | Coder | >= 2.33.0, < 2.33.8 |
| Coder | Coder | >= 2.34.0, < 2.34.2 |
References
- https://github.com/coder/coder/pull/25877Issue Tracking, Patch
- https://github.com/coder/coder/releases/tag/v2.29.17Release Notes
- https://github.com/coder/coder/releases/tag/v2.32.7Release Notes
- https://github.com/coder/coder/releases/tag/v2.33.8Release Notes
- https://github.com/coder/coder/releases/tag/v2.34.2Release Notes
- https://github.com/coder/coder/security/advisories/GHSA-2mg2-p7r7-g27fPatch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-55078?
How severe is CVE-2026-55078?
How do I fix CVE-2026-55078?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-5506The Wavr plugin for WordPress is vulnerable to Stored Cross-…6.4
- CVE-2026-55069Kestra is an open-source, event-driven orchestration platfor…8.7
- CVE-2026-5507When restoring a session from cache, a pointer from the seri…4
- CVE-2026-55075Coder allows organizations to provision remote development e…7.4
- CVE-2026-55076Coder allows organizations to provision remote development e…7.4
- CVE-2026-55077Coder allows organizations to provision remote development e…7.2
- CVE-2026-55079Coder allows organizations to provision remote development e…6.5
- CVE-2026-5508The WowPress plugin for WordPress is vulnerable to Stored Cr…6.4
- CVE-2026-55081DHIS2 is a flexible information system for data capture, man…7.3
- CVE-2026-55082DHIS2 is a flexible information system for data capture, man…8.7
- CVE-2026-55084DHIS2 is a flexible information system for data capture, man…8.8
- CVE-2026-5509An authenticated command injection vulnerability exists in t…7.2
Are you affected by CVE-2026-55078?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST